Meaning of ATOMIC NUMBER 12

WordNet Dictionary
	Definition:		[n]  a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
	Synonyms:		magnesium, Mg
	See Also:		carnallite, dolomite, magnesia, magnesite, magnesium oxide, metal, metallic element, olivine, periclase, spinel